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Chin. Phys., 2003, Vol. 12(1): 45-50    DOI: 10.1088/1009-1963/12/1/008

The effect of degenerate atomic levels on the field state dissipation in two-photon Jaynes--Cummings model

Zhou Ling, Song He-Shan, Li Chong, Guo Yan-Qing
Department of Physics, Dalian University of Technology, Dalian 116024, China
Abstract  The dissipation of the field in the two-photon Jaynes--Cummings model (JCM) with degenerate atomic levels was studied. The initial degenerate atomic state affects the field coherence loss. When the degenerate atom is initially in an equal probability superposition state, the field coherence loss is smallest. It is found that the degeneracy of the atomic level increases the period of entanglement between the atom and the field. When the degeneracy was considered, the coherence properties of the field could be affected by the reservoir qualitatively, if a nonlinear two-photon process is involved. This is different from the dissipation of one-photon JCM with degenerate atomic levels.
Keywords:  two-photon JCM      degenerate atomic levels      field dissipation  
Received:  19 March 2002      Revised:  10 September 2002      Published:  20 January 2003
PACS:  42.50.Dv (Quantum state engineering and measurements)  
  42.50.Pq (Cavity quantum electrodynamics; micromasers)  
  32.80.-t (Photoionization and excitation)  

Cite this article: 

Zhou Ling, Song He-Shan, Li Chong, Guo Yan-Qing The effect of degenerate atomic levels on the field state dissipation in two-photon Jaynes--Cummings model 2003 Chin. Phys. 12 45

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